[folks: 8/10] Add comment about async create_source_registry method.

[Jeremy Whiting <jpwhiting src gnome org>]

commit 67858bfb322d1b09680b343092eebdbb048fe37a
Author: Jeremy Whiting <jpwhiting kde org>
Date:   Tue Jun 12 09:43:26 2012 -0600

    Add comment about async create_source_registry method.

 backends/eds/lib/edsf-persona-store.vala |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/backends/eds/lib/edsf-persona-store.vala b/backends/eds/lib/edsf-persona-store.vala
index 1a2eb30..393feb7 100644
--- a/backends/eds/lib/edsf-persona-store.vala
+++ b/backends/eds/lib/edsf-persona-store.vala
@@ -28,6 +28,8 @@ using GLib;
 
 extern const string BACKEND_NAME;
 
+/* The following function is needed in order to use the async SourceRegistry
+ * constructor. */
 [CCode (cname = "e_source_registry_new", cheader_filename = "libedataserver/libedataserver.h", finish_function = "e_source_registry_new_finish")]
 public extern static async E.SourceRegistry create_source_registry (GLib.Cancellable? cancellable = null) throws GLib.Error;